<template>
  <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card class="box-card">
          <!-- 提示区域 -->
           <el-alert title="添加商品信息" center type="info" show-icon :closable="false"></el-alert>
          <!-- 步骤条区域 -->
           <el-steps :space="300" :active="activeIndex -0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
           </el-steps>
            <el-form :model="addForm" :rules="addFormRules" ref="ruleForm" label-width="100px" label-position="top">
                <!-- tab栏区域 -->
                <el-tabs v-model="activeIndex" tab-position="left" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                        <el-tab-pane label="基本信息" name="0">
                             <el-form-item label="商品名称" prop="goods_name">
                                <el-input v-model="addForm.goods_name"></el-input>
                            </el-form-item>
                            <el-form-item label="商品价格" prop="goods_price">
                                <el-input v-model="addForm.goods_price" type="number"></el-input>
                            </el-form-item>
                            <el-form-item label="商品重量" prop="goods_weight">
                                <el-input v-model="addForm.goods_weight"></el-input>
                            </el-form-item>
                            <el-form-item label="商品数量" prop="goods_number">
                                <el-input v-model="addForm.goods_number" type="number"></el-input>
                            </el-form-item>
                            <el-form-item label="商品分类" prop="goods_cat">
                                <!-- optiong:用来指定数据源, :props: 用来指定级联选择器的配置对象 -->
                                <el-cascader :options="CateList" v-model="addForm.goods_cat" @change="handleChange"
                                :props="{ expandTrigger: 'hover',value:'cat_id', label:'cat_name', children:'children'}">
                                </el-cascader>
                            </el-form-item>
                        </el-tab-pane>

                        <el-tab-pane label="商品参数" name="1">
                            <!-- 渲染表单的Item项 -->
                            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                                <!-- 复选框组 -->
                                <el-checkbox-group v-model="item.attr_vals">
                                    <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                                </el-checkbox-group>
                            </el-form-item>
                        </el-tab-pane>

                        <el-tab-pane label="商品属性" name="2">
                            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                                <el-input v-model="item.attr_vals"></el-input>
                            </el-form-item>
                        </el-tab-pane>

                        <el-tab-pane label="商品图片" name="3">
                            <!-- action: 表示图片要上传到的后台API地址 -->
                            <el-upload :action="uploadURL" :on-preview="handlePreview"
                                :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                                <el-button size="small" type="primary">点击上传</el-button>
                            </el-upload>
                        </el-tab-pane>
                        <el-tab-pane label="商品内容" name="4">
                            <!-- 富文本编辑器组件 -->
                            <quill-editor v-model="addForm.goods_introduce"> 
                            </quill-editor>
                            <!-- 添加商品的按钮 -->
                            <el-button class="el-btn" type="primary" @click="add">添加商品</el-button>
                        </el-tab-pane>
                </el-tabs>
            </el-form>
      </el-card>

      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" class="previewImg">
      </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
    name:'Add',
    data(){
        return{
            activeIndex: '0',
            //添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price: 0,
                goods_number: 0,
                goods_weight: 0,
                //商品所属的分类数组
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs: []
            },
            //表单验证规则对象
            addFormRules:{
                goods_name:[
                    {required: true, message:'请输入商品名称', trigger:'blur'},
                ],
                goods_price:[
                    {required: true, message:'请输入商品价格', trigger:'blur'},
                ],
                goods_number:[
                    {required: true, message:'请输入商品数量', trigger:'blur'},
                ],
                goods_weight:[
                    {required: true, message:'请输入商品重量', trigger:'blur'},
                ],
                goods_cat:[
                    {required: true, message:'请选择商品分类', trigger:'blur'},
                ]     
            },
            //商品分类的列表
            CateList: [],

            //动态参数列表数据
            manyTableData:[],
            //静态属性列表数据
            onlyTableData:[],
            //要上传的头像的地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对像
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            
            previewPath: '',
            previewVisible: false
                
            
        }
    },
    created(){
        this.getCateList();
    },

    methods: {
        /* 获取所有商品分类的数据 */
        async getCateList(){
            const {data: res} = await this.$http.get('categories');
            if(res.meta.status !== 200){
                this.$message.error('获取商品分类失败!');
            }
            this.CateList = res.data;
        },

        /* 级联选择器选中项变化，会触发的函数 */
        handleChange(){
           console.log('@@',this.addForm.goods_cat);
           if(this.addForm.goods_cat.length !== 3){
               this.addForm.goods_cat.length = [];
           }
          },

          /*  */
          beforeTabLeave(activeName, oldActiveName){
              console.log('即将离开的标签名字:',oldActiveName)
              console.log('即将进入的标签名字:',activeName)
              if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                  this.$message.error('请先选中商品分类!');
                  return false;
              }

            },
            /*  */
        async tabClicked(){
            /* console.log('@',this.activeIndex); */
            //证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                console.log('动态参数面板!');
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                        {params:{sel: 'many'} }
                 )
                 if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败!')
                 }

                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 
                            ? [] :item.attr_vals.split(' ');
                    })
                    this.manyTableData = res.data;

            }else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                        {params:{sel: 'only'} }
                 )
                 if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性列表失败!')
                 }
                 this.onlyTableData = res.data;
            }
        },
        /* 处理图片预览效果 */
        handlePreview(file){
            this.previewPath = file.response.data.url;
            this.previewVisible = true;
        },

        /* 处理移除图片的操作 */
        handleRemove(file){
             //1. 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            //2. 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath);
            //3. 调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1);
            console.log("@@",this.addForm);
        },

        /* 监听图片上传成功的事件 */
        handleSuccess(response){
            /* console.log(response); */
            //1. 拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            //2. 将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo);
            console.log("@@",this.addForm)
        }, 
        /* 添加商品 */
        add(){
        /* console.log('@@',this.addForm); */
            this.$refs.ruleForm.validate(async vaild => {
                if(!vaild){
                    return this.$message.error('请填写必要的表单项!')
                }
                //执行添加业务逻辑
                const form = _.cloneDeep(this.addForm);
                form.goods_cat = form.goods_cat.join(',');
                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {attr_id:item.attr_id, attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                //处理静态属性
                this.onlyTableData.forEach(item =>{
                    const newInfo = {attr_id:item.attr_id, attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs;
                console.log(form)
                //发起请求添加商品
                //商品的名称，必须是唯一的
                const {data: res} = await this.$http.post('goods',form);
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败!');
                }
                this.$message.success('添加商品成功!'); 
                this.$router.push('/goods');
            });

        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2];
            }
            return null;
        }
    }
}
</script>

<style scoped>
    .el-checkbox{
        margin: 0 10px 0 0;
    }
    .previewImg{
        width: 100%;
    }
    .el-btn{
        margin-top: 18px;
    }
</style>